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Description
RAM Double Ball Mount with Round & Diamond Bases - B Series - Long ArmRAM B 138U C RAM Double Ball Mount with Round & Diamond Bases B Size Long The RAM B 138U C is a drill down mounting solution pairing a round AMPS base and a diamond AMPS base on a long B Series double socket arm, giving extra reach with near infinite adjustment and two mounting hole options. Key Features Round base with the universal AMPS hole pattern for surface mounting; diamond base with the 2 hole AMPS pattern for lighter device holders Includes
RAM-B-138U-C RAM® Double Ball Mount with Round & Diamond Bases – B Size Long
The RAM-B-138U-C is a drill-down mounting solution pairing a round AMPS base and a diamond AMPS base on a long B Series double socket arm, giving extra reach with near-infinite adjustment and two mounting-hole options.
Key Features
- Round base with the universal AMPS hole pattern for surface mounting; diamond base with the 2-hole AMPS pattern for lighter device holders
- Includes one round ball base, one diamond ball base, and a long B Size double socket arm for extended reach
- Ball-and-socket technology allows near-infinite adjustability and dampens shock and vibration
- Powder-coated, marine-grade aluminium construction
- Backed by RAM Mounts' lifetime warranty
Works With
The round base bolts down using the 4-hole or 3-hole AMPS pattern, while the diamond base connects to RAM® and many third-party cradles with the 2-hole AMPS pattern. The 1" B Size balls suit any RAM® holder built for a B Size ball.
Dimensions & Specifications
- Overall height: 185.7mm (7.31")
- Arm length: 152mm (6") overall, 134mm (5.25") socket-to-socket
- Diamond base: 61.7 x 33.3mm (2.43 x 1.31"), 2-hole AMPS 48.6mm (1.912") centre-to-centre
- Round base: 63.5mm (2.5") diameter; 4-hole AMPS 30 x 38mm, 3-hole AMPS 120° 46.0mm
- Ball size: 1" rubber ball, B Size
- Material: powder-coated marine-grade aluminium
- Weight: 331g (0.73 lbs)
- Load rating: 907g (2 lbs) standard use, 454g (1 lb) heavy-duty use
What's Included
- RAM-B-202U round base with 1" ball
- RAM-B-238U diamond base with 1" ball
- RAM-B-201U-C long double socket arm for B Size 1" balls
FAQs
Q: What size screws do the base plates take?
A: The AMPS patterns most commonly take #8, #10, M4, or M5 screws. If you're pairing this with a RAM® holder, the holder comes with its own hardware; surface-mount hardware for your own application isn't included.
Installation Video
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.8 ★★★★★
Based on 1375 reviews
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Product Reviews
★★★★★ 5
Great Replacement Cabin Air Filters for my 2008 Honda Civic
Size: 2Pcs, Size: 2Pcs
Item Reviewed: CF10134 Cabin Air Filter with Activated Carbon Replacement for CP134, Fit for Honda Accord/Civic/Odyssey/CR-V and Acura MDX/TSX/TLX/RDX/Ridgeline (2 pack)
ℹ️ Summary
I picked these up because I needed some replacement cabin air filters for my 2008 Honda Civic. These seem like decent quality and they were a perfect fit in my car. For $15 at time of order for two air filters it was a solid deal that I can glad recommend to others. I hate writing short reviews, but there’s not much else to say about these.
Here is how I rate items:
5 ⭐️ = Completely exceeds expectations.
4 ⭐️ = Works well with minor concerns.
3 ⭐️ = Does the job, nothing special.
2 ⭐️ = Some things work, but lots of issues.
1 ⭐️ = Didn’t work well, not worth it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 30, 2025
★★★★★ 4
Good fit for Acura MDX
Size: 8.8" x 9.3" x 1.1"
This is an air cabin filter that will fit many cars, and in my case a 2019 MDX. Since this kind of filter is not doing anything critical like keeping dirt out of an engine, I shop around for non-OEM filters for something that strikes a balance between price versus performance. This filter just filters out dust in a car cabin, and when we’re not in our cars, we don’t have the benefit of an air filter when we are walking around outdoors. At a fraction of the price of an Acura filter, this filter seems to strike that balance. The filter media looks sturdy and is embedded with charcoal to help absorb odors.
Installation is very straightforward in my MDX, and similar in most cars. There is a compartment door inside the glovebox that first must be removed before changing the filter. Pay attention to the direction flow arrow that shows which way the filter should be installed.
Overall I am satisfied with this filter. It is inexpensive, fits perfectly, and seems to do the job just fine. It is definitely worth trying if you are trying to save money.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 12, 2024
★★★★★ 5
These filters do the job
Size: 2Pcs
Fits great in my '08 Accord LX and my '19 Accord Sport 2.0t. They filter air well and are easy to install like any cabin air filter in a Honda. I am pleased. Good value for the price.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 8, 2025
★★★★★ 5
Fit my 2014 Odyssey TE
Size: 8.8" x 9.3" x 1.1"
Comes with printed instructions for those who haven't changed it before. Here is the specific use case from my van.
On my 2014 TE its easy to access behind the glove box, open to usual full open then just push the left and right sides in to allow the glove box to come fully out. It may pop off of the mounts, don't panic it snaps right back on. Then look for the little rectangular panel with two small levers on either side. on the black plastic under the dash that you can now see and access. Press the levers and pull towards you, doing a bit of a wiggle to get it out. Its tight, but it will come out with having to break it. Don't gorilla hands it, it will break.
There is a directional arrow on the filter, which you have to remove from the wrapper before installing. Yes, someone *will* forget that. Reassembly the reverse of removal. Check that video sharing site online if you need visual instructions.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 27, 2024
★★★★★ 5
Fits perfectly, and works great!!
Item Package Quantity: 1
★★★★★ – Great Quality Cabin Filter for the Price
Installed this Puroma cabin air filter in my car and immediately noticed cleaner airflow and less odor coming through the vents.
The activated carbon really helps with smells and dust. Installation was quick and easy, only took a few minutes.
Great value compared to dealership prices. Would definitely buy again.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 26, 2026
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